P. Keller

Bimodal System Dynamic A Technology Assessment and Forecasting Approach

P. Keller, U. Ledergerber, 1998 .

Republic of Uzbekistan: Recent Economic Developments

P. Keller, L. Hansen, 1997 .

Republic of Tajikistan : recent economic developments

P. Keller, Tapio Saavalainen, 1996 .